A cuticle-degrading protease (CDEP-1) of Beauveria bassiana enhances virulence

A cuticle-degrading protease (CDEP-1) of Beauveria bassiana enhances virulence
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白僵菌的角质层降解蛋白酶 (CDEP-1) 增强毒力

DOI:
10.1080/09583150802082239
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发表时间:
2008-01
影响因子:
1.4
通讯作者:
Xing-Yong Yang
Xing-Yong Yang
中科院分区:
农林科学4区
文献类型:
--
作者:
Di Wu;Yan-Hua Fan;Zhi-Bing Luo;Ming-Guang Feng;Yan Pei;Yong-Jun Zhang;Xing-Yong Yang

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摘要为了研究球孢白僵菌Pr 1蛋白酶(CDEP-1)对昆虫病原真菌的毒力增强作用,利用甲醇营养型酵母毕赤酵母(Pichia pastoris)表达了一种球孢白僵菌Pr 1蛋白酶(CDEP-1),并将其作为B三种浓度梯度喷雾剂的添加剂。在6个生物测定中,将巴西孢菌株(Bb 0062)接种于无翅型绿色桃蚜(Myzus persicae)成虫。所得数据符合时间-浓度-死亡率模型。一般来说,真菌病原体对蚜虫物种的LC 50估计值随着CDEP-1浓度从0到100 µg mL−1的增加而降低。在20-100 µg mL−1的浓度下,喷雾后第5-7天的LC 50降低了1.5-2.5倍。然而,单独喷洒20-100 µg CDEP-1 mL-1水溶液与仅喷水相比对蚜虫死亡率没有显著影响。在50 µg mL−1的浓度下加入灭活的CDEP-1也不会显著影响真菌对蚜虫的毒力。我们的研究结果首次证实,角质层降解蛋白酶CDEP-1增强真菌的毒力,由于加速分生孢子萌发和角质层渗透。这表明了一种利用蛋白酶进行微生物控制的新方法。
Abstract In order to investigate virulence enhancement of entomopathogenic fungi, a Beauveria bassiana-sourced Pr1 protease (CDEP-1) was expressed by a methylotrophic yeast Pichia pastoris and then used as an additive to three gradient sprays of B. bassiana strain (Bb0062) onto apterous green peach aphid Myzus persicae adults in six bioassays. The resultant data fit well to a time–concentration–mortality model. Generally, the LC50 estimates of the fungal pathogen against the aphid species decreased with increasing CDEP-1 concentrations from 0 to 100 µg mL−1. The LC50s on days 5–7 after spray were reduced by 1.5–2.5-fold at the concentrations of 20–100 µg mL−1. However, sprays of 20–100 µg CDEP-1 mL−1 aqueous solution alone had no significant effect on aphid mortality compared to water spray only. Neither did inclusion of inactivated CDEP-1 at a concentration of 50 µg mL−1 affect significantly the fungal virulence to aphids. Our results confirm for the first time that the cuticle-degrading protease CDEP-1 enhanced fungal virulence due to acceleration of conidial germination and cuticle penetration. This suggests a new approach to utilising the protease in microbial control.
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影响因子: 3.4
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